[INFO] fetching crate token-cell 2.0.0...
[INFO] checking token-cell-2.0.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate token-cell 2.0.0 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate token-cell 2.0.0
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate token-cell 2.0.0
[INFO] tweaked toml for crates.io crate token-cell 2.0.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate token-cell 2.0.0 on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate token-cell 2.0.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 03e0c11ed147130718cb269fda1b560b33bf3de1f15715dbfe1b78c88be4a4b8
[INFO] running `Command { std: "docker" "start" "-a" "03e0c11ed147130718cb269fda1b560b33bf3de1f15715dbfe1b78c88be4a4b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "03e0c11ed147130718cb269fda1b560b33bf3de1f15715dbfe1b78c88be4a4b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "03e0c11ed147130718cb269fda1b560b33bf3de1f15715dbfe1b78c88be4a4b8", kill_on_drop: false }`
[INFO] [stdout] 03e0c11ed147130718cb269fda1b560b33bf3de1f15715dbfe1b78c88be4a4b8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid -Dunmustuse_in_always_ok" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 34216d18d9a775ce9fc0e66bcbd4f8d91ce9dab6583c490ebcf029ce393ca383
[INFO] running `Command { std: "docker" "start" "-a" "34216d18d9a775ce9fc0e66bcbd4f8d91ce9dab6583c490ebcf029ce393ca383", kill_on_drop: false }`
[INFO] [stderr]     Checking ghost-cell v0.2.6
[INFO] [stderr]     Checking token-cell v2.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unexpected `cfg` condition name: `features`
[INFO] [stdout]   --> src/lib.rs:12:17
[INFO] [stdout]    |
[INFO] [stdout] 12 | #![cfg_attr(not(features = "std"), no_std)]
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
[INFO] [stdout]    = note: `#[warn(unexpected_cfgs)]` on by default
[INFO] [stdout] help: there is a config with a similar name and value
[INFO] [stdout]    |
[INFO] [stdout] 12 - #![cfg_attr(not(features = "std"), no_std)]
[INFO] [stdout] 12 + #![cfg_attr(not(feature = "std"), no_std)]
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `$crate::core::TokenCell`
[INFO] [stdout]   --> src/macros.rs:9:17
[INFO] [stdout]    |
[INFO] [stdout]  9 |             use $crate::core::TokenCell;
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/lib.rs:37:1
[INFO] [stdout]    |
[INFO] [stdout] 37 | runtime_token!(pub RuntimeToken);
[INFO] [stdout]    | -------------------------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout]    = note: this warning originates in the macro `runtime_token` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<TokenGuard<'_, T, Token>, Infallible>
[INFO] [stdout]   --> src/monads.rs:46:33
[INFO] [stdout]    |
[INFO] [stdout] 46 |         let borrowed = unsafe { self.cell.try_guard(token).unwrap_unchecked() };
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<TokenGuardMut<'_, T, Token>, Infallible>
[INFO] [stdout]   --> src/monads.rs:87:33
[INFO] [stdout]    |
[INFO] [stdout] 87 |         let borrowed = unsafe { self.cell.try_guard_mut(token).unwrap_unchecked() };
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<RuntimeToken, Infallible>
[INFO] [stdout]   --> src/macros.rs:20:67
[INFO] [stdout]    |
[INFO] [stdout] 20 |                   fn new() -> Result<Self, Self::ConstructionError> {
[INFO] [stdout]    |  ___________________________________________________________________^
[INFO] [stdout] 21 | |                     Ok($id(
[INFO] [stdout] 22 | |                         COUNTER.fetch_add(1, core::sync::atomic::Ordering::Relaxed),
[INFO] [stdout] 23 | |                     ))
[INFO] [stdout] 24 | |                 }
[INFO] [stdout]    | |_________________^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/lib.rs:37:1
[INFO] [stdout]    |
[INFO] [stdout] 37 |   runtime_token!(pub RuntimeToken);
[INFO] [stdout]    |   -------------------------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `runtime_token` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<RuntimeToken, Infallible>
[INFO] [stdout]   --> src/macros.rs:21:21
[INFO] [stdout]    |
[INFO] [stdout] 21 | /                     Ok($id(
[INFO] [stdout] 22 | |                         COUNTER.fetch_add(1, core::sync::atomic::Ordering::Relaxed),
[INFO] [stdout] 23 | |                     ))
[INFO] [stdout]    | |______________________^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/lib.rs:37:1
[INFO] [stdout]    |
[INFO] [stdout] 37 |   runtime_token!(pub RuntimeToken);
[INFO] [stdout]    |   -------------------------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `runtime_token` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<RuntimeToken, Infallible>
[INFO] [stdout]   --> src/macros.rs:26:21
[INFO] [stdout]    |
[INFO] [stdout] 26 |                     Self::new().map(f)
[INFO] [stdout]    |                     ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/lib.rs:37:1
[INFO] [stdout]    |
[INFO] [stdout] 37 | runtime_token!(pub RuntimeToken);
[INFO] [stdout]    | -------------------------------- in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `runtime_token` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `token-cell` (lib) due to 5 previous errors; 2 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "34216d18d9a775ce9fc0e66bcbd4f8d91ce9dab6583c490ebcf029ce393ca383", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "34216d18d9a775ce9fc0e66bcbd4f8d91ce9dab6583c490ebcf029ce393ca383", kill_on_drop: false }`
[INFO] [stdout] 34216d18d9a775ce9fc0e66bcbd4f8d91ce9dab6583c490ebcf029ce393ca383
